Warning: Recompiling Graphics, checksum changed for C:\lazarus\components\lazutils\lib\x86_64-win64\graphmath.ppu
graphics.pp(29,17) Fatal: Can't find unit Graphics used by IntfGraphics
Warning: Recompiling Graphics, checksum changed for C:\lazarus\components\lazutils\lib\x86_64-win64\graphmath.ppu
graphics.pp(41,37) Fatal: Can't find unit Graphics used by IntfGraphics
it can't find unit Graphics while compiling unit graphics?
It can't find "Graphics" while compiling "IntfGraphics" (which has a circular ref via implementation uses)
But that is not the issue with the above errors...
GraphMath in in LazUtils => it should have been compiled before, and should not be able to change (not going into all details here).
Yet it has.
So something is wrong.
Go into the folders
C:\lazarus\components\lazutils\
C:\lazarus\lcl
C:\lazarus\units
and delete all *.o and *.ppu files that you can find (including sub folders)
Search *all* folders for any other occurrence of
graphmath.ppu => that should only have been in C:\lazarus\components\lazutils\lib / and only one file
IntfGraphics.ppu
Graphics.ppu
However, at that point it might be easier to unistall, delete any remains in c:\lazarus and then do a new install.
All your config is in %AppData%
Menu View > Ide Internals > About IDE => search primary config path
Your config should be kept, even if you uninstall. But you can backup it too.
There is a slim change, you have something really wrong in your config. But unlikely.